Influence of formic acid on fungal flora of barley and on aflatoxin production inAspergillus flavus link |
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| Authors: | Gunnel Clevström Tord Möller Bo Göransson Annika Liljensjöö Hans Ljunggren |
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| Affiliation: | (1) Department of Microbiology, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden;(2) The National Food Administration, S-75126 Uppsala, Sweden;(3) The National Veterinary Institute, S-75002 Uppsala, Sweden |
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| Abstract: | In recent yearsAspergillus flavus and aflatoxin production have been noted on several occasions in grain preserved with formic acid. Samples of mouldy barley treated with formic acid and stored in an open bin were investigated for the presence of fungi. In the lower part of the bin there was a clear dominance ofFusarium sporotrichioides, and deoxynivalenol and neosolaniol were detected.A. flavus andA. fumigatus were also present.Paecilomyces variotii occurred, almost as a pure culture, in the upper part of the bin, but no patulin was found. Cultivation of four fungal isolates from these genera on laboratory substrates containing formic acid showedP. variotii to be the most tolerant to formic acid, withstanding 150 mM, but still without patulin production.F. sporotrichioides andA. fumigatus tolerated only 6 mM formic acid. The growth ofA. flavus was reduced and atypical at 60 mM formic acid. Pretreatment ofA. flavus spores with formic acid increased aflatoxin production about 800 times. |
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| Keywords: | Aspergillus flavus aflatoxin barley fungal flora formic acid |
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